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#1 |
Registered User
Join Date: Oct 2011
Location: NorthWest
Posts: 131
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6l80e or 6l90e in a C10
I haven’t seen many builds of c10s utilizing a newer 6 or 10 speed automatics. Can you guys direct me to some builds where I can read and learn about a 6l80e or 6l90e being put behind an LS in a 1967-1972 c10?
Is there a reason not many are doing it? Fitment, source-ability? price? am I better off with a 4l80e? ![]() |
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#2 |
Registered User
Join Date: Apr 2009
Location: PNW
Posts: 553
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Re: 6l80e or 6l90e in a C10
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#3 |
Registered User
Join Date: Sep 2020
Location: Cleveland, Ohio
Posts: 530
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Re: 6l80e or 6l90e in a C10
You are better off with a 4l as the controller for the 6L if you are not using an LS or LT engine with matching computer is almost $1000 in itself.
They work great as I have a 6l80E in my 68 C10, but I wouldn't go out of my way to install one. The final gear ratio is the same as the 4L and you are just adding more gears. Plus the 4L shifts better. With the 6L, you have to install the high hump. I am not sire if you have to do this with a 4L. |
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#4 |
Senior Member
![]() Join Date: Mar 2015
Location: washington
Posts: 2,234
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Re: 6l80e or 6l90e in a C10
The final gear ratio is not the same as the 4L60's.
The 700R4/4L60E/4l65E/4L70E all are 1 to one in third and 4 is a .7:1 overdrive. The 6l80E has two OD ratios, both 5th and 6th. 5th gear is almost identical to 4th (OD) in the 4L60. at .7 to 1. The 6L80's 6 gear is .5 to 1, nominally. Last edited by Accelo; 02-16-2023 at 01:04 PM. |
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#5 | |
Registered User
Join Date: Sep 2020
Location: Cleveland, Ohio
Posts: 530
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Re: 6l80e or 6l90e in a C10
Quote:
Really, all they did is add a steeper 1st gear, and stuck a 5th gear in between 4th and 6th. 4th gear in a 6l is 1.15:1, not your typical 1:1, so it just doesn't have the huge drop like the 4l. Last edited by Joyridin; 02-14-2023 at 04:59 PM. |
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#6 |
Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: 6l80e or 6l90e in a C10
All I know is I rebuilt my first two 6L80's last December. Each was over $1200 in parts.
I could rebuild many 4Lxxx's for that
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